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Production technology for polypropylene tubing containing beta crystal form

A polypropylene pipe material and production process technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipe fittings, etc., to achieve the effect of enhanced thermal stability and increased crystal content

Active Publication Date: 2012-06-27
WUHAN KINGBULL ECONOMIC DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many kinds of β-nucleating agents found so far, but there are few β-nucleating agents that have high β-nucleation efficiency and can induce PP to form a high-content β-crystal form

Method used

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  • Production technology for polypropylene tubing containing beta crystal form

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw materials comprising 100 parts by weight of polypropylene resin, 0.05 part of beta nucleating agent cyclohexanamide phthalate and 1 part of beta-PP special color masterbatch (melt index 7.2g / 10min) were mixed uniformly and placed in Extrude and granulate at 200°C to obtain granular raw materials. The granular raw materials were heated and sheared in the extruder until the raw materials were completely melted and plasticized. The barrel temperature of the extruder was 190°C, and the die head temperature was 230°C. Then, the melted and plasticized pipe is pre-cooled by an air bath on the outer surface through an air pre-cooling device at a temperature of -20°C. Then the pipe is cooled by a vacuum box and a cooling water box, and the temperature of the cooling water is 10°C. Finally, the cooled pipe is annealed at 100° C. for 12 hours to obtain the polypropylene pipe 1 containing β crystal form.

Embodiment 2

[0022] The raw materials comprising 100 parts by weight of polypropylene resin, 0.1 part of β-nucleating agent naphthalene dicarboxylic acid cyclohexylamide and 1 part of β-PP special color masterbatch (melt index 7.2g / 10min) were mixed uniformly and placed in Extrude and granulate at 210°C to obtain granular raw materials. The granular raw materials were heated and sheared in the extruder until the raw materials were completely melted and plasticized. The barrel temperature of the extruder was 200°C, and the die head temperature was 230°C. Then, the melted and plasticized pipe is pre-cooled with an air bath on the outer surface by an air pre-cooling device at a temperature of -10°C. Then the pipe is cooled by a vacuum box and a cooling water box, and the temperature of the cooling water is 15°C. Finally, the cooled pipe is annealed at 110° C. for 10 hours to obtain the β-crystal-containing polypropylene pipe 2 .

Embodiment 3

[0024] The raw materials including 100 parts by weight of polypropylene resin, 0.2 parts of β-nucleating agent zinc pimelate and 2 parts of β-PP special color masterbatch (melt index 7.2g / 10min) were mixed uniformly and heated at 205°C Down extrusion granulation to obtain granular raw materials. The granular raw materials were heated and sheared in the extruder until the raw materials were completely melted and plasticized. The barrel temperature of the extruder was 210°C, and the die head temperature was 210°C. Then the outer surface of the melted and plasticized pipe is pre-cooled by an air bath at a temperature of 70°C through an air pre-cooling device. Then the pipe is cooled by a vacuum box and a cooling water box, and the temperature of the cooling water is 15°C. Finally, the cooled pipe is annealed at 100° C. for 8 hours to obtain the β-crystal-containing polypropylene pipe 3 .

[0025] The preparation method of the zinc pimelic acid is as follows: after the zinc hydr...

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Abstract

The invention provides a production technology for a polypropylene tubing containing a beta crystal form, which comprises the following steps: mixing granulation, fusing plasticization, air precooling, water cooling and annealing. The K beta value of the polypropylene tubing produced by the production technology disclosed by the invention is more than 0.6, and the polypropylene tubing has favorable thermostability.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a production process for polypropylene pipes containing β crystals. Background technique [0002] Polypropylene (PP for short) has the characteristics of low density, hygiene, non-toxicity, good corrosion resistance, easy processing, and low price. It is widely used in construction, chemical pipelines and other fields. However, PP has poor low-temperature impact resistance, especially when it is brittle below -15°C, which severely limits the application of PP pipes in cold regions. In order to solve the problem of PP low-temperature brittleness, various methods of improving the impact strength of PP have been tried. Among them, the research on improving the impact resistance of PP by generating β-crystal PP through crystallization modification technology is very popular. [0003] As a semi-crystalline polymer, PP has various crystal structures such as α, β, γ, δ and pseudo-hexa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/02C08K5/3432C08K5/098C08K3/22C08K5/46C08K5/092C08K5/3437B29C47/92F16L9/12B29C48/92
CPCB29C48/09B29C48/04B29C48/92B29C2948/92704B29C2948/92895B29C2948/92904B29C2948/92923
Inventor 陈厚忠
Owner WUHAN KINGBULL ECONOMIC DEV
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